A widget which will display your latest Flickr photos.
This plugin makes it easy to pull Flickr feeds and display them on your site.
After installing and activating the plugin, go to WordPress Admin >> Appearance >> Widgets
Find "Simple Flickr Widget" and drug and drop this widget at which widget area you want to show it.
You need Flickr ID number, To get Flickr ID number, go to your Flickr account >> photostream
Now Look at you addressbar, it look like the following
Just copy the Flickr ID like this (937xxxx5@N02) and paste this at Flickr ID number field at widget area and set others options as your need.